— Not at all. I'd be happy to.
A:Isn't it very cold today?
B:Are you feeling ill today?
C:Would you mind opening the window?
D:Have you bought the kite to me?
“一袋大米,吃去 25 ”,把____看作单位“1”,____× 25 =____ 。
关于声音,下列说法中正确的是( )
若数列an前8项的值各异,且an+8=an对任意的n∈N都成立,则下列数列中可取遍an前8项值的数列为( )
如图,在△ABC中,AB=4,AC=3,BC=5,△ABD、△ACE、△BCF都是等边三角形,则四边形AEFD的面积为____